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Abstract

Photo tracing machines (PTMs) generate glass used in the photolithographic imaging of circuit and land patterns on printed circuit boards. To accurate lines and patterns, the PTM must be aligned. This is done by orienting the land and circuit lines at various angles to one another, a optical assembly which rotates the land patterns circuit lines. The optical assembly rotates a circuit image about its center as it is projected onto a This rotation must be done in a manner that the positional error of the image; errors are as the optical centerline is offset from the mirror mechanical centerline. The alignment procedure as follows:

Country

United States

Language

English (United States)

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K-Mirror Alignment Procedure

Photo
tracing machines (PTMs) generate glass used in the
photolithographic imaging of circuit and land patterns on printed
circuit boards. To accurate lines and
patterns, the PTM must be
aligned. This is done by orienting the
land and circuit lines at
various angles to one another, a optical assembly which rotates the
land patterns circuit lines. The optical
assembly rotates a circuit
image about its center as it is projected onto a This rotation must
be done in a manner that the positional error of the image; errors
are as the optical centerline is offset from the mirror mechanical
centerline. The alignment procedure as
follows:

Remove the
K-Mirror assembly unit from the PTM.
Before begins
care should be taken not to touch the surface as it is extremely
sensitive (Fig. 2). Begin the K-Mirror
by removing the top cover
plate, ring cover and the top half of encoder bracket. Then remove
the encoder disk consisting of glass disk and its mounting

Gently remove
the K-Mirror prism 1 (Fig. 1) with its hardware.
Loosen mounting block 2 (Fig. 4) and the K-Mirror and accompanying
hardware from the Then remove mounting
ring (not shown) with spacers
3 attached. Remove the K-Mirror base
from the assembly base 5 (Fig.
2) with the plano still mounted to the base.

A plano
mirror 4 (Fig. 2) is mounted so that its front is
perpendicular to the K-Mirror housing's base 5.
An shown) is
required to achieve a squareness within one of arc to the housing's
base 5. Using the surface top surface as
the reference plane, align
an parallel to this plane within one second of
The autocollimator
should be at such height that its passes through the mounting hole in
the housing where K-Mirror prism has just been removed. The mounting
of the housing where the plano mirror bracket is is parallel to the
granite surface plate (not

With the
optical path of the autocollimator passing the hole in
the housing, reflect the beam off of the mirror's front surface.
Note the vertical angular from perpendicularity that the plano mirror
Horizontal deviations may be corrected
by to plano mirror
adjustment. Lap the bottom of the mirror
bracket and recheck for
squareness until the is more than one second of arc. Torque all
three mounting (not shown) to 6 in. lbs., equally, to prevent
movement of the mirror. Having squared
the plano to the bottom
surface of the K-Mirror housing, this is now ready to be mounted on
the air bearing

Before
assembling the K-Mirror optics on the air bearing 6
(Fig. 1), the runout of the spindle should be
Install the three
adjustable legs 24 (Fig. 1) to bottom of the interferometer block 25
(Fig. 1). Using electronic indicator,
adjust the three legs until
the surface on top of the interferometer block is to the granite
surface plate within 0.0001 inch. in air at 55 psi @ 3.5 - 4.0 CFH
through the spindle supply port on the front of t...